<template>
  <div class="app-container">
    <h2 style="text-align: center;">发布新课程</h2>
    <el-steps :active="1" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息" />
      <el-step title="创建课程大纲" />
      <el-step title="提交审核" />
    </el-steps>

    <el-form label-width="120px">
      <el-form-item label="课程标题">
        <el-input v-model="courseInfo.title" placeholder=" 示例：机器学习项目课：从基础到搭建项目视频课程。专业名称注意大小写" />
      </el-form-item>
      <!-- 所属分类 -->
      <el-form-item label="课程分类">
        <el-select
          @change="subjectLevelOneChanged"
          v-model="courseInfo.subjectParentId"
          placeholder="请选择一级分类"
        >
          <el-option
            v-for="subject in subjectOneList"
            :key="subject.id"
            :label="subject.title"
            :value="subject.id"
          />
        </el-select>
        <el-select v-model="courseInfo.subjectId" placeholder="请选择二级分类">
          <el-option
            v-for="subject in subjectTwoList"
            :key="subject.id"
            :label="subject.title"
            :value="subject.id"
          />
        </el-select>
      </el-form-item>

      <!-- 课程讲师 -->
      <el-form-item label="课程讲师">
        <el-select v-model="courseInfo.teacherId" placeholder="请选择">
          <el-option
            v-for="teacher in teacherList"
            :key="teacher.id"
            :label="teacher.name"
            :value="teacher.id"
          />
        </el-select>
      </el-form-item>
      <el-form-item label="总课时">
        <el-input-number
          :min="0"
          v-model="courseInfo.lessonNum"
          controls-position="right"
          placeholder="请填写课程的总课时数"
        />
      </el-form-item>
      <!-- 课程简介-->
      <el-form-item label="课程简介">
        <tinymce :height="300" v-model="courseInfo.description" />
      </el-form-item>

      <!-- 课程封面-->
      <el-form-item label="课程封面">
        <el-upload
          :show-file-list="false"
          :on-success="handleAvatarSuccess"
          :before-upload="beforeAvatarUpload"
          :action="BASE_API+'/eduoss/fileoss'"
          class="avatar-uploader"
        >
          <img :src="courseInfo.cover" />
        </el-upload>
      </el-form-item>
      <el-form-item label="课程价格">
        <el-input-number
          :min="0"
          v-model="courseInfo.price"
          controls-position="right"
          placeholder="免费课程请设置为0元"
        />元
      </el-form-item>
      <el-form-item>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="saveOrUpdataAndNext">保存并下一步</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>
<script>
import course from "@/api/edu/course";
import teacher from "@/api/edu/teacher";
import subject from "@/api/edu/subject";
import Tinymce from "@/components/Tinymce";
const defaultForm = {
  title: "",
  subjectId: "",
  subjectParentId: "",
  teacherId: "",
  lessonNum: 0,
  description: "",
  cover: "/static/1.jpg",
  price: 0,
};
export default {
  components: { Tinymce },
  data() {
    return {
      saveBtnDisabled: false, // 保存按钮是否禁用
      courseInfo: defaultForm,
      teacherList: [],
      subjectOneList: [],
      subjectTwoList: [],
      // 获取dev.env.js里面的地址接口API地址
      BASE_API: process.env.BASE_API,
      courseId: "",
    };
  },
  created() {
    if (this.$route.params && this.$route.params.id) {
      this.courseId = this.$route.params.id;
      this.getCourseInfo();
      this.getListTeacher();
    } else {
      this.getListTeacher();
      this.getOneSubject();
    }
  },
  methods: {
    getCourseInfo() {
      course.getCourseInfo(this.courseId).then((response) => {
        this.courseInfo = response.data.courseInfoVo;
        subject.getAllSubject().then((response) => {
          this.subjectOneList = response.data.list;

          for (var i = 0; i < this.subjectOneList.length; i++) {
            var oneSubject = this.subjectOneList[i];
            if (this.courseInfo.subjectParentId == oneSubject.id) {
              this.subjectTwoList = oneSubject.children;
            }
          }
        });
      });
    },
    addCourse() {
      course.addCourseInfo(this.courseInfo).then((response) => {
        this.$message({
          type: "success",
          message: "添加课程信息成功",
        });
        this.$router.push({
          path: "/course/chapter/" + response.data.courseId,
        });
      });
    },
    updataCourse() {
      course.updateCourseInfo(this.courseInfo).then((response) => {
        this.$message({
          type: "success",
          message: "修改课程信息成功",
        });
        this.$router.push({
          path: "/course/chapter/" + this.courseId,
        });
      });
    },
    saveOrUpdataAndNext() {
      if (!this.courseInfo.id) {
        this.addCourse();
      } else {
        this.updataCourse();
      }
    },
    getListTeacher() {
      teacher.getListTeacher().then((response) => {
        this.teacherList = response.data.list;
      });
    },
    getOneSubject() {
      subject.getAllSubject().then((renponse) => {
        this.subjectOneList = renponse.data.list;
      });
    },
    subjectLevelOneChanged(value) {
      // console.log(value);
      for (let i = 0; i < this.subjectOneList.length; i++) {
        if (this.subjectOneList[i].id === value) {
          this.subjectTwoList = this.subjectOneList[i].children;
        }
      }
      this.courseInfo.subjectId = "";
    },

    handleAvatarSuccess(res, file) {
      console.log(res); // 上传响应
      console.log(URL.createObjectURL(file.raw)); // base64编码
      this.courseInfo.cover = res.data.url;
    },
    beforeAvatarUpload(file) {
      const isJPG = file.type === "image/jpeg";
      const isLt2M = file.size / 1024 / 1024 < 2;
      if (!isJPG) {
        this.$message.error("上传头像图片只能是 JPG 格式!");
      }
      if (!isLt2M) {
        this.$message.error("上传头像图片大小不能超过 2MB!");
      }
      return isJPG && isLt2M;
    },
  },
};
</script>

<style scoped>
.tinymce-container {
  line-height: 29px;
}
</style>